#### Answer

36

#### Work Step by Step

As shown on page 445, we know that $a^{\frac{m}{n}}=\sqrt[n] a^{m}=(\sqrt[n] a)^{m}$.
Therefore, $216^{\frac{2}{3}}=\sqrt[3] 216^{2}=(\sqrt[3] 216)^{2}=6^{2}=36$.
We know that $\sqrt[3] 216=6$, because $6^{3}=216$.